What is the unit of entropy?
Correct answer B. J/K
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Physics MCQs
Page 7 of Physics multiple-choice questions with answers. Tap an option to check yourself.
Page 7 of 45
Which of the following quantities is a state function?
Correct answer A. Internal energy
What is the purpose of a flywheel in an engine?
Correct answer A. To smooth out energy variation
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Which conditions must be met for a heat engine to operate successfully?
Correct answer C. Both of these
How much work is done in an isochoric process?
Correct answer D. Zero
By what other name is an adiabatic process known?
Correct answer A. Isentropic process
During which process does entropy stay constant?
Correct answer D. Adiabatic
Which expression gives the average translational kinetic energy per molecule of an ideal gas?
Correct answer A. 3RT/2Na
How is Boltzmann’s constant k expressed in terms of the universal gas constant R and Avogadro’s number NA?
Correct answer C. k = R/NA
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Which molecular property is the same for all gases at a given temperature?
Correct answer A. Kinetic energy
What are the temperature and pressure at the triple point of water?
Correct answer D. 273.16 K at 0.611 kPa
For a gas obeying Boyle’s law, what happens to the volume when the pressure is doubled?
Correct answer A. one half
For a Carnot heat engine, what does the area enclosed by the cycle ABCDA on a P-V diagram represent?
Correct answer B. Work done during one cycle
At what temperature does the Fahrenheit reading equal twice the Celsius reading?
Correct answer D. 160°C
Standard temperature and pressure (STP) refers to a gas under which conditions?
Correct answer D. All of the above
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Which statement about internal energy is true?
Correct answer D. All of these
According to Pascal’s law, how does the pressure of a gas in a container act?
Correct answer A. Same in all directions
One degree on the Celsius scale is equal in size to how many Fahrenheit degrees?
Correct answer B. 1.8 degrees of Fahrenheit scale
At what temperature do the Fahrenheit and Celsius scales give the same reading?
Correct answer A. −40
What is the normal human body temperature of 98.6°F on the Celsius scale?
Correct answer A. 37°C